Array

Arrays

• Storing multiple data items of the same data type that can be represent by a common name
• The data items are allocated in continuous memory locations and can be referred by a single name
• Example:
  • int studentMark [5]

Index	Value	Memory Location
0	75	100000
1	80	100002
2	85	100004
3	90	100006
4	95	100008

• Each individual data item is referred as an array element
  • studentMark[0] = 75
• Each array element is referred to by the array name followed by one or more subscripts with each subscript enclosed in square brackets
  • studentMark[0]
• Each subscripts must be expressed as non-negative integer
• An array must be declared and define before it can be used
• Declaration and definition tell the compiler the name of the array, the type of data and the number of elements
• Example
  • An array name studentMark type integer and size 5

Data Type------Array Name-------Size
int--------------studentMark-------[5]

# include
int main( )
{
int n[10] = {32, 27, 64, 18, 95, 14, 90, 70, 60, 37};
int i;

printf("%s%13s\n", "Element", "Value");

for(i = 0; i <= 9; i++) printf("%7d%13d\n", i, n[i]); return 0; }

Output:

Element	Value
0	32
1	27
2	64
3	18
4	95
5	14
6	90
7	70
8	60
9	37

Multi Dimensional Array

• The number of subscripts determines the dimensionality of the array
• The multi dimensional arrays are defined in much the same manner as one-dimensional arrays
• A pair of square brackets is required for each dimension
• A two dimensional array will require two pairs of square brackets
  • int studentMark [5][10]